Early Cretaceous methane seepage system and associated carbonates, biota and geochemistry, Sverdrup Basin, Ellef Ringnes Island, Nunavut

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atmire.migration.oldid1518
dc.contributor.advisorBeauchamp, Benoit
dc.contributor.advisorGrasby, Stephen
dc.contributor.authorWilliscroft, Krista
dc.date.accessioned2013-10-02T21:50:46Z
dc.date.available2013-11-12T08:00:20Z
dc.date.issued2013-10-02
dc.date.submitted2013en
dc.description.abstractOver one hundred carbonate deposits, interpreted as having formed at methane seepage sites in the Sverdrup Basin have been discovered on Ellef Ringnes Island, Canadian Arctic. The deposits, up to 2.7 metres tall and 60 metres wide, are found within the lower member of the Lower Cretaceous Christopher Formation, a silty marine shale. The carbonates have complex and heterogeneous structures typical of seep carbonates, including banded botryoidal and clotted textures as well as void filling sparite. Stable carbon isotopes show highly 13C-depleted values, as low as δ13CVPDB = -53‰, indicative of authigenic carbonate precipitation via the anaerobic oxidation of biogenic methane. Abundant and well-preserved fauna include multiple species of bivalves, worm tubes, ammonites and gastropods. Methane seepage is calculated to have lasted ~500,000 years and was brought about by a tensional stress regime as well as salt diapirism related faulting.en_US
dc.identifier.citationWilliscroft, K. (2013). Early Cretaceous methane seepage system and associated carbonates, biota and geochemistry, Sverdrup Basin, Ellef Ringnes Island, Nunavut (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/25767en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/25767
dc.identifier.urihttp://hdl.handle.net/11023/1102
dc.language.isoeng
dc.publisher.facultyGraduate Studies
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subjectBiogeochemistry
dc.subjectGeochemistry
dc.subjectGeology
dc.subject.classificationArcticen_US
dc.subject.classificationMethaneen_US
dc.subject.classificationSeepen_US
dc.subject.classificationCarbonateen_US
dc.subject.classificationEllefen_US
dc.subject.classificationRingnesen_US
dc.titleEarly Cretaceous methane seepage system and associated carbonates, biota and geochemistry, Sverdrup Basin, Ellef Ringnes Island, Nunavut
dc.typemaster thesis
thesis.degree.disciplineGeoscience
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue
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